You may be "technically correct" (the best kind of correct), but holy je-BUS was QT NOT user-friendly nor cross-platform-friendly at the height of its popularity.

There's a reason that once alternatives became available, users left QT as quickly as they could.

QT was pioneering A/V solutions; I won't argue against that. So was Flash, so was Shockwave, so was RealMedia, and remember the horror that was Windows Media Player (from the Win98 era)?